What is the difference between WD Elements and WD Passport external HD?
I just bought a WD Passport Ultra hard drive. It shows that USB 3.0 is compatible with USB 2.0. What does this mean?

Please tell me if those questions are the same.
A: no

What is an Orthodox Jew?
What do all Orthodox Jews agree on?

Please tell me if those questions are the same.
A: no

How does a long distance relationship work?
Is there a single case of a successful long distance relationship?

Please tell me if those questions are the same.
A:
yes